An attack helicopter is equipped with a 20-
mm cannon that ﬁres 198 g shells in the
forward direction with a muzzle speed of
711 m/s. The fully loaded helicopter has a
mass of 4810 kg. A burst of 75.3 shells is ﬁred
in a 6.27 s interval.
What is the resulting average force on the
helicopter?
Answer in units of N